AI 中文总结
J-ATLAS拟开展M31-M33系统宽场光学光谱巡天，通过先导巡天验证关键技术后将绘制星系外围结构并约束多种天体物理参数。
AI 中文摘要
近邻星系的外围保留着长期存在的等级并合信号，是星系形成的化石记录。J-ATLAS即Javalambre仙女座与三角座遗产天体物理巡天，是一项拟议的宽场光学光谱巡天，使用JST/T250和JPCam对M31-M33系统开展观测。借助密集的J-PAS滤光片系统，它将为北天可见的最近大质量旋涡星系环境中的分辨恒星、致密恒星系统、发射线源及背景天体提供均匀的低分辨率光学SED。该巡天将绘制星系盘、星系晕、星流、卫星星系及星系际区域的分布，约束恒星族群、测光金属丰度、富碳演化恒星、星团、行星状星云及低表面亮度子结构。我们还介绍了正在开展的先导巡天，其以巨南星流和仙女座I为中心，92个完整指向正在被分析，以验证拥挤场测光、校准、源分类及测光金属丰度诊断，之后将该方法扩展至完整的J-ATLAS覆盖区巡天。
英文摘要
The outskirts of nearby galaxies preserve long-lived signatures of hierarchical assembly and provide a fossil record of galaxy formation. J-ATLAS, the Javalambre Andromeda and Triangulum Legacy Astrophysical Survey, is a proposed wide-field optical photospectroscopic survey of the M31--M33 system with JST/T250 and JPCam. Using the dense J-PAS filter system, it will deliver homogeneous low-resolution optical SEDs for resolved stars, compact stellar systems, emission-line sources, and background objects across the nearest massive spiral-galaxy environment visible from the northern sky. The survey will map disks, halos, streams, satellites, and the intergalactic region, constraining stellar populations, photometric metallicities, carbon-rich evolved stars, star clusters, planetary nebulae, and low-surface-brightness substructure. We also present the ongoing pilot survey, centred on the Giant Southern Stream and Andromeda~I, whose 92 complete pointings are being analysed to validate crowded-field photometry, calibration, source classification, and photometric metallicity diagnostics before extending the methodology to the full J-ATLAS footprint survey.
CommentsThe Hidden Beauty of the Galactic Outskirts. Proceeding IAU Symposium 403, 2025
